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le <br /> cc )) V <br /> - `Quarterly Status RepLk <br /> ".� Beacon Station 492 —Manteca, California <br /> Page 2 <br /> SUMMARY OF THIS QUARTER'S ACTIVITIES: <br /> Quarterly ground-water moni-toring was performed at the site on <br /> December 13, 1991. Depth-to-water measurements and <br /> ground-water samples were collected from the three <br /> ground-water monitoring wells at the site. <br /> RESULT OF QUARTERLY MONITORING: <br /> Depth-to-water measurements show the elevation of the water <br /> surface in the three ground-water monitoring wells to be <br /> within 0.02-feet of each other <br /> Ground-water analyses show all three wells to have <br /> nondetectable TPHg and BTEX concentrations. BTEX detection <br /> limits were 0.5 ppb and the TPHg detection limit was 50.0 ppb. <br /> PROPOSED ACTIVITY OR WORK FOR NEXT QUARTER: <br /> ACTIVITY ESTIMATED COMPLETION DATE <br /> Perform first quarter 1992 ground-water <br /> monitoring March, 1992 <br /> Prepare Workplan for installing <br /> an additional monitoring well in <br /> the downgradient direction of the <br /> Beacon hydrocarbon source once the <br /> "2 site" gradient is evaluated February 1992 <br /> Acquire air permit to reinstate vapor <br /> extraction at the site Late First Quarter 1992 <br /> -,�E'C"' �� bs a <br /> MAR 12 1992 <br /> ENTAL HIEA , H <br /> EN�ieR �� <br /> PER[VII!T/SERVICE <br />